Slug casting mold



July 3, 1934. w, PETERSEN 1,964,859

SLUG CAS-T ING MOLD Filed July 11, 1932 2 Sheets-Sheet 1 INVENTOR A TTORNE Y6 y 3, 1934- w. L. PETERSEN 1,964,859

SLUG CASTING MOLD Filed July 11. 1952 2 Sheets-Sheet 2 Fig.4

1 I I v INVENTOR I AW Fig. 3 is a perspective view of the mold cap for the improved mold;

Fig. 4 is a horizontal transverse section through another old form of mold and knife block, the mold again being shown in its vertical or slug ejecting position;

Fig. 5 is a view similar to Fig. 4, but showing the improved mold with its slug guiding shoes formed on the core sections; and

Fig. 6 is a view similar to Fig. 5, showing an other form of improved mold with slug guiding shoes formed on the core sections.

As usual, the mold (carried by a rotatable mold disc 0), comprises a body portion A and a cap portion B which define the opposite side walls of the mold slot or cavity, being separated by two intermediate liners, not shown, which define the opposite end walls of thecavity. The mold shown being of the head-letter or display variety, its cap portion B is provided with a series of core members or sections B separted by foreand-aft grooves B the core members extending into the mold cavity and terminating short of the front face of the mold so as to form there a longitudinal recess B The skeleton form of slug cast in the above mold presents a relatively thin body portion S formed between the upper surface A of the body portion Aand the lower surfaces b of the core members B an overhanging face or character bearing. portion S (cast in the front recess B and a series of transverse ribs S projecting from the body portion and giving support to the face portion (these ribs being cast in the fore-and-aft grooves B of the cap portion).

After the'slug is cast and the mold carried by the rotatable disc 0 from its horizontal casting position to its vertical ejecting position (in which latter position it is shown), the ejector blade P is advanced against the rear edge of the body portion S of the slug and, by continued forward movement, forcefully ejects the slug from the mold and between the slug trimming knives Q and Q all in the usual manner. 1

Because of the recessed form of the cast slug, the left-hand knife Q will offer more resistance to the slug than the right-hand knife Q and moreover the pressure exerted by the ejector blade P will be confined to the rear edge of the slug body portion S for these reasons, the slug will tend to twist or cant toward the cap portion B of the mold as it is ejected andtrimmed. During the first part of its movement, this tendency of the slug is overcome by the guiding surface A of the mold body portion A and the guiding surfaces b of the core sections B these opposed surfaces bearing, as before stated, on the opposite sides of the slug body portions S As the rear edge of the slug approaches the front face of the mold, its body portion S moves out of engagement with the guiding surfaces 12 of the core sections, leaving the slug to be guided at its upper side by the engagement of the supporting ribs S with the lower surface of the cap portion or the upper walls of the fore-andaft grooves B These supporting ribs S however, are not substantial enough to, prevent the slug from twisting or canting in the mold, and they therefore become crushed or broken down (see Fig. l, which shows the old form of mold). This breaking down or crushing of the supporting ribs S is, of itself, sufficient to render the slug unfit for use, but the twisting of the slug produces other harmful results. Thus, it will be observed by reference to Fig. 1 that, as the slug twists in the mold, its body portion S is turned sidewise against the sharp edge of the left-hand trimming knife Q and the continued advance of the ejector blade causes either the rear edge of the body portion to be severed or else jams the slug between the two knives. In the latter event, the knives or the ejector blade, or both, may become damaged, requiring replacement.

According to the present invention, specifically (see Fig. 2), the lower slug guiding surfaces 12 of certain of the core sections B are extended forwardly to the front face of the mold, so as to be of the same fore-and-aft extent as the slug guiding surface A of the body portion A. In the preferred embodiment illustrated, this is accomplished by providing the selected core sections at their lower front corners with guiding shoes C, whose lower surfaces are flush with the guid'ng surfaces b of the respective core sections. In distributing the guiding shoes throughout the length of the mold, so that a minimum number thereof may be used to produce the desired result, one is located on a centrally located core section and one on a core section near each end of the mold (see Fig. 3). While it might be possible to obtain the desired result with a lesser or greater number of guiding shoes, it has been found that three, placed as shown, function in a thoroughly satisfactory manner.

The functioning of the guide shoes C will be apparent from Fig. 2. There it will be noted that, during ejection and trimming, the slug is guided in a straight path, with no danger of tilting or canting, because of the engagement of the mold surfaces with the body portion S until the latter leaves the mold. These mold guiding surfaces are, of course, the top face A of the mold body portion, on the one hand, and the lower faces b of the core sections B as well as the bottom faces of the guiding shoes C, on the other hand. The effect is as if the lower faces of the core sections themselves were extended to the front face of the mold. The supporting ribs S will also aid, as before, in the guiding of the slug at its upper side but now, with the shoes C present, they alone will not be required to effect such guiding just before the rear edge of the slug leaves the mold.

As shown in Fig. 2, the presence of the guiding shoes C cause recesses S to be formed in the slug at the junction of the body portion S and the overhanging portion S To avoid any weakening effect of these recesses, the guiding shoes C are bifurcated or slotted, as at C whereby substantial supporting ribs will be formed on the slug in the regions of the recesses.

In Fig. 4, there is illustrated a form of mold D adapted to cast a skeleton or recessed slug with a characterbearing surface or face portion T overhanging the bodyv portion T at both sides. On the ribbed side of the slug, the overhanging portion is cast partly in the front mold groove B and partly within the routing notches of the matrices, while on the opposite side of the slug the overhanging portion is formed entirely within the routing notches of the matrices. During ejection, this slug will also have a tendency to cant or tilt, and this tendency is overcome, as in the first embodiment, by providing the core sections of the mold cap with the guiding shoes C, as shown in Fig. 5.

The form of mold illustrated in Fig. 6 differs from that firstdesoribed only in that the lower portion of the front face of the'cap portion B is formed with a longitudinal groove or recess B opening into, but of less depth (fore-and-aft), than, the recess B In this recess B there is cast a part S of the character bearing portions S which extends beyond the supporting ribs S thereof. In ejecting a slug from a mold of this character, the difiiculties before mentioned are greatly exaggerated. Thus, in the present instance, after the slug has been advanced far enough to bring the rear ends of the supporting ribs S past the rear wall of the recess B it is obvious that the slug will be entirely devoid of any guiding influence, even the ribs being rendered impotent by the presence of the recess. By providing the core sections with the shoes C, however, the slug can and will be guided properly until it is completely ejected from the mold since the shoes serve in conjunction with the mold body portion to furnish a bearing for the body portion of the slug throughout the whole fore-and-aft extent of the mold.

Although the guiding shoes have been described as integral parts of certain of the core sections, they could be detachably secured to the core sections, if desired.

The words front, rear, etc. are used herein in a relative sense only for purposes of description, and no limitation is intended.

Having thus described my invention, what I claim is:

1. In or for a slug casting machine, a mold comprising side and end walls defining between them a mold cavity, and a core member supported within said cavity and terminating short of the front face of the mold so as to leave a recess in such front face, said core member having its slug guiding surface extended across said recess substantially to the front face of the mold.

2. In or for a slug casting machine, a mold com prising side and end walls defining between them a mold cavity, and a series of core members supported within said cavity and terminating short of the front face of the mold so as to leave a recess in such front face, certain of said core members having their slug guiding surfaces extended across said recess substantially to the front face of the mold.

3. In or for a slug casting machine, a mold comprising side and end Walls defining between them a mold cavity, and a series of core members supported Within said cavity and terminating short of the front face of the mold so as to leave a recess in such front face, certain of said core members being provided with slug guiding shoes extending forwardly across said recess substantially to the front face of the mold, the slug guiding surfaces of said shoes being flush with the slug guiding surfaces of said core members.

4. In or for a slug casting machine, a mold comprising side and end walls defining between them a mold cavity, and a series of core members supported within said cavity and terminating short of the front face of the mold so as to leave a recess in such front face, certain of said core members being provided with slotted slug guiding shoes projecting forwardly across said recess substantially to the front face of the mold, the slug guiding surfaces of said shoes being flush with the slug guiding surfaces of said core members.

5. In or for a slug casting machine, a mold comprising side and end walls defining between them a mold cavity, and a series of core members supported within said cavity and terminating short of the front face of the mold so as to leave a recess in such front face, three of said core members being provided with guiding shoes extending forwardly across said recess substantially to the front face of the mold, one of said guiding shoes being located centrally of the mold, and the other two being located adjacent opposite ends thereof, the slug guiding surfaces of said shoes being flush with the slug guiding surfaces of said core members.

6. In or for a slug casting machine, a mold comprising cap and body portions, said cap portion being formed with a longitudinal recess in the lower portion of its front face, and a core member supported within the mold cavity and terminating short of the front face of the mold so as to coincide with the rear wall of the longitudinal recess, said core member having its slug guiding surface extended across said longitudinal recess substantially to the front face of the mold.

7. In or for a slug casting machine, a mold comprising cap and body portions, said cap portion being formed with a longitudinal recess in the lower portion of its front face, and a series of core members supported Within the mold cavity and terminating short of the front face of the mold and constituting the rear wall of the longitudinal recess, certain of said core members having their slug guiding surfaces extended across said longitudinal recess substantially to the front face of the mold.

8. In or for a slug casting machine, a mold comprising cap and body portions, said cap portion being formed with a longitudinal recess in the lower portion of its face, and a series of core members supported within the mold cavity and terminating short of the front face of the mold and constituting the rear Wall of said recess, certain of said core members being provided with slug guiding shoes projecting forwardly across said longitudinal recess substantially to the front face of the mold, the slug guiding surfaces of said shoes being flush with the slug guiding surfaces of said core members.

WILLIAM L. PETERSEN.

Ill)

CERTIFICATE OF CORRECTION.

Pate'nt'No. 1,964,859.- July 3,; 1934];

WILLIAM L. PETERSEN.

It is herebycertified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 123,-v claim 8, after "its" insert from; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the. Patent Office.-

Signed and-sealed this 7th-day of August, A. D. 1934.

Leslie Frazer (Seal) Acting Commissioner of Patent;- 

